Sign up to hand-stomp the famously tart beverage and support The Leukemia & Lymphoma Society.

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Sign up to hand-stomp the famously tart beverage and support The Leukemia & Lymphoma Society on Thursday, April 21 in Santa Monica.

Southern Californians' lives brim with repeated movements, those brief actions that are performed again and again, actions that have become part of the hum of the city.

Catching a wave applies here, as does flipping your blinker to merge onto a freeway. The snap of a clapboard on a film set counts, as brandishing a phone to snap a selfie at a red-carpet premiere.

Let's also add lemonade hand-stomping to that hallowed list of small SoCal actions that are oft-repeated. Hot Dog on a Stick first opened next to the Santa Monica Pier in 1946, and its signature beverage is made by pushing down on a lever to mix all of that tart citrus-y goodness, with the end result being sunshine in a cup.

The old-school method of drink-making has its fans, and many of those lemonade lovers will be out at the original Hot Dog on a Stick stand at Muscle Beach on Thursday, April 21 to try their hand at hand-stomping lemonade.

The Lemonade Stomp-A-Thon is a day-long fundraiser for The Leukemia & Lymphoma Society, and everyone from celebrities to former Hot Dog on a Stick employees to bigwigs to regulars will take a turn at the stomper from 11 a.m. to 6 o'clock.

That's seven hours of straight-up lemonade hand-stomping.

The "seven" is no randomly chosen number, of course. It's Hot Dog on a Stick's 70th anniversary, and the company, which sells its batter-dipped dogs at locations across the country, hopes to raise $70,000 for LLS via the seven-hour fundraiser.

Want to join in and do some hand-stomping for a very important cause? Pick a half-hour window and throw your name in.

And if you can't make it, but can donate online, you'll get a coupon for one dollar.

Seven hours, Santa Monica, and a whole bunch of stomping of the citrus-sunshiny sort, for a sweet reason. Nice. Also nice that it's a true Southern California classic, the Hot Dog on a Stick lemonade.

It's as local as catching a wave or merging onto the 405 or closing a clapboard on a film set or snapping a selfie in Hollywood.